Structural Stability of Pyrochlore Manganate In2Mn2O7 Under High Pressure

Hui Li,Xin Wang,Shuailing Ma,Jili Ye

doi:10.3389/fphy.2021.783136

Hui Li, Xin Wang + Show 2 more

Open Access

https://doi.org/10.3389/fphy.2021.783136

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Abstract

The pyrochlore manganate In2Mn2O7 is a very promising ferromagnetic semiconductor material, which has a good application prospect in spin transport due to its very low electron effective mass, high Curie temperature, and structural stability. In this paper, In2Mn2O7 with pyrochlore structure was successfully prepared by high temperature and high pressure combined with the sol–gel method, and the in situ high-pressure X-ray diffraction experiment was carried out on it. The results showed that the structure of In2Mn2O7 was very stable in the pressure range of 0–29.0 GPa, and its bulk modulus was given. This lays a foundation for the application of In2Mn2O7 in extreme environments.

Highlights

In the past decades, there has been increasing interest in the pyrochlore oxide materials for the studies in both basic science [1, 2] and engineering [3]
The manganate In2Mn2O7 was successfully prepared by the sol–gel method combined with high temperature and high pressure
Through X-ray diffraction (XRD) characterization at atmospheric pressure, In2Mn2O7 was identified as a pyrochlore structure, and its exact crystallographic data and structural refinement parameters were given

Summary

INTRODUCTION

There has been increasing interest in the pyrochlore oxide materials (general formula A2B2O7) for the studies in both basic science [1, 2] and engineering [3]. Ho2Ti2O7 and Dy2Ti2O7 are Ising pyrochlore materials with Ising anisotropy and effective antiferromagnetic exchange interaction [4] They have classical spin-ice ground state, and the magnetic moment at each tetrahedral vertex forms a two-in and a two-out degenerate distribution. Wei Chen et al searched for undoped ferromagnetic semiconductors through high-throughput computational screening [26] They found that magnetic pyrochlore oxide In2Mn2O7 has a good application prospect in spin transport due to its very low effective electron mass, large exchange splitting of conduction band, stability in air, and high Curie temperature of 130 K. The structural stability In2Mn2O7 has been investigated by angle-dispersive synchrotron X-ray powder diffraction at high pressures. Rietveld analyses were performed with the software GSAS [31]

RESULTS AND ANALYSIS

CONCLUSION

DATA AVAILABILITY STATEMENT